package com.cslc.mp.util;

import java.io.IOException;
import java.io.InputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.cslc.mp.bean.message.Article;
import com.cslc.mp.bean.message.RespNewsMessage;
import com.cslc.mp.bean.message.RespTextMessage;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

/**
 * 消息工具类
 * @author keliangliang
 *
 */
public class MessageUtil {
	
	private static Logger logger = Logger.getLogger(MessageUtil.class.getName());
	
	/** 
     * 返回消息类型：文本 
     */  
    public static final String RESP_MESSAGE_TYPE_TEXT = "text";  
  
    /** 
     * 返回消息类型：音乐 
     */  
    public static final String RESP_MESSAGE_TYPE_MUSIC = "music";  
  
    /** 
     * 返回消息类型：图文 
     */  
    public static final String RESP_MESSAGE_TYPE_NEWS = "news";  
  
    /** 
     * 请求消息类型：文本 
     */  
    public static final String REQ_MESSAGE_TYPE_TEXT = "text";  
  
    /** 
     * 请求消息类型：图片 
     */  
    public static final String REQ_MESSAGE_TYPE_IMAGE = "image";  
  
    /** 
     * 请求消息类型：链接 
     */  
    public static final String REQ_MESSAGE_TYPE_LINK = "link";  
  
    /** 
     * 请求消息类型：地理位置 
     */  
    public static final String REQ_MESSAGE_TYPE_LOCATION = "location";  
  
    /** 
     * 请求消息类型：音频 
     */  
    public static final String REQ_MESSAGE_TYPE_VOICE = "voice";  
  
    /** 
     * 请求消息类型：推送 
     */  
    public static final String REQ_MESSAGE_TYPE_EVENT = "event";  
  
    /** 
     * 事件类型：subscribe(订阅) 
     */  
    public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";  
  
    /** 
     * 事件类型：unsubscribe(取消订阅) 
     */  
    public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";  
  
    /** 
     * 事件类型：CLICK(自定义菜单点击事件) 
     */  
    public static final String EVENT_TYPE_CLICK = "CLICK";  
	
    /**
     * 事件类型：scancode_push(扫码推事件)
     */
    public static final String EVENT_TYPE_SCANCODE_PUSH = "scancode_push";
	
    /**
     * 事件类型：scancode_waitmsg(扫码推事件且弹出“消息接收中提示框的事件推送”)
     */
    public static final String EVENT_TYPE_SCANCODE_WAITMSG = "scancode_waitmsg";
	
    /**
     * 事件类型：scan(扫描带参数二维码事件)
     */
	public static final String EVENT_TYPE_SCAN = "SCAN";
	
	/**
	 * 解析微信发来的请求（xml）
	 * 
	 */
	public static Map<String, String> parseXml(HttpServletRequest request) {
		 // 将解析结果存储在HashMap中  
        Map<String, String> map = new HashMap<String, String>();  
        
        // 从request中取得输入流  
        InputStream inputStream;
		try {
			inputStream = request.getInputStream();
			// 读取输入流  
	        SAXReader reader = new SAXReader();  
	        Document document = reader.read(inputStream);  
	        // 得到xml根元素  
	        Element root = document.getRootElement();  
	        // 得到根元素的所有子节点  
	        @SuppressWarnings("unchecked")
			List<Element> elementList = root.elements();  
	  
	        // 遍历所有子节点  
	        for (Element e : elementList)  
	            map.put(e.getName(), e.getText());  
	  
	        // 释放资源  
	        inputStream.close();  
	        inputStream = null;   
		} catch (IOException e) {
			logger.error(e.getMessage());
		} catch (DocumentException e) {
			logger.error(e.getMessage());
		} 
		return map;
	}
	/**
	 * 文本消息对象转换成xml
	 * @param textMessage 文本消息对象
	 * @return
	 */
	public static String textMessageToXml(RespTextMessage textMessage) {
		xstream.alias("xml", textMessage.getClass());
		return xstream.toXML(textMessage);
	}
	
	/** 
	 * 图文消息对象转换成xml 
	 *  
	 * @param newsMessage 图文消息对象 
	 * @return xml 
	 */  
	public static String newsMessageToXml(RespNewsMessage newsMessage) {  
	    xstream.alias("xml", newsMessage.getClass());  
	    xstream.alias("item", new Article().getClass());  
	    return xstream.toXML(newsMessage);  
	}  
	
	/** 
	 * 扩展xstream，使其支持CDATA块 
	 *  
	 */  
	private static XStream xstream = new XStream(new XppDriver() {  
	    public HierarchicalStreamWriter createWriter(Writer out) {  
	        return new PrettyPrintWriter(out) {  
	            // 对所有xml节点的转换都增加CDATA标记  
	            boolean cdata = true;  
	  
	            @SuppressWarnings("unchecked")  
	            public void startNode(String name, Class clazz) {  
	                super.startNode(name, clazz);  
	            }  
	  
	            protected void writeText(QuickWriter writer, String text) {  
	                if (cdata) {  
	                    writer.write("<![CDATA[");  
	                    writer.write(text);  
	                    writer.write("]]>");  
	                } else {  
	                    writer.write(text);  
	                }  
	            }  
	        };  
	    }  
	}); 
}
